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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Power Supply Controllers, Monitors

STMicroelectronics SRK2001TR

Name: SRK2001TR
Brand: STMicroelectronics
SKU: SRK2001TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SRK2001TR

Manufacturer:: STMicroelectronics

Category:: Power Supply Controllers, Monitors

Package:: 10-SOP (0.154", 3.90mm Width)

Datasheet:: SRK2001TR.pdf

Description:: IC SMART DVR SYNC REC LLC 10SSOP

Quantity:: RFQ Add To RFQ list

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Inventory:5,410

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Product details

Overview

SRK2001TR from STMicroelectronics is a secondary-side adaptive synchronous rectification controller optimized for LLC resonant converters with center-tapped secondary windings. It features dual N-channel MOSFET gate drivers, 35 ns total turn-off delay, 50 μA quiescent current in low-consumption mode, and Kelvin drain-source sensing up to 90 V. It enables high-efficiency AC-DC power supplies meeting 90+/92+ server SMPS efficiency standards.

For engineers reviewing the SRK2001TR datasheet, SRK2001TR pinout, SRK2001TR application, or SRK2001TR equivalent, this page delivers verified technical context on adaptive turn-on/off logic, parasitic inductance compensation, sleep-mode programmability, and ZCD-based fast turn-off protection - all critical for LLC converter design validation and light-load optimization.

Technical Context

The SRK2001TR implements asynchronous state-machine control for two independent SR MOSFETs, with interlocked gate drivers preventing simultaneous conduction. Its adaptive turn-on masking time (100 ns–2 μs) and two-slope adaptive turn-off algorithm eliminate need for external parasitic inductance compensation circuits.

It integrates ZCD comparator with self-adaptive threshold and 450 ns blanking window for fast current-inversion detection during load transients or above-resonance operation. The PROG and EN pins enable user-programmable sleep/burst mode entry/exit duty cycles via resistor networks, supporting dynamic efficiency tuning across 1%–80% load range.

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Range	4.5 V to 32 V - supports direct bias from LLC output rail without auxiliary winding; internal clamp at 36 V protects against overvoltage.
I_q (Low-Consumption Mode)	50 μA - enables compliance with <100 mW no-load power requirements in 80+/85+/90+/92+ SMPS standards.
Turn-Off Delay	35 ns total - minimizes body diode conduction loss while maintaining safe zero-current switching margin.
DVS Sensing Range	−3 V to +90 V (Kelvin-referenced) - supports high-voltage secondary designs with accurate drain-source voltage monitoring.
ZCD Response Time	Fast turn-off triggered by zero-current detection - prevents SR MOSFET failure and half-bridge destruction during short-circuit or rapid load steps.
Sleep Mode Entry	User-programmable via PROG pin resistor (e.g., 100 kΩ → 40% min. duty cycle) - enables precise light-load efficiency optimization without firmware changes.
Gate Drive Sink Current	4 A peak (ZCD-triggered) - ensures robust, sub-100 ns forced turn-off under fault conditions.

Pinout & Package

SRK2001TR is housed in SSOP10 package (3.9 mm × 4.9 mm, 0.65 mm pitch), optimized for thermal performance on PCBs with ≥25 mm² copper pour under GND pin.

Pin	Circuit Role	Design Meaning
1 VCC	Supply input	Bias rail for internal logic and gate drivers; requires local 100 nF ceramic bypass capacitor to GND for stable operation under pulsed gate drive loads.
2 GND	Power and signal reference	Common return for gate drive currents and internal control circuitry; must connect to SR MOSFET source common point to ensure Kelvin sensing accuracy.
3 GD1 / 8 GD2	Gate driver outputs	Totem-pole outputs driving N-MOSFET gates directly; clamped to 11 V max to limit gate charge and prevent overvoltage stress at high VCC.
4 SVS1 / 7 SVS2	Source voltage references	Kelvin sense inputs referenced to respective SR MOSFET sources; must connect directly to source terminals to reject PCB trace resistance errors.
5 DVS1 / 6 DVS2	Drain voltage sensing	High-side Kelvin inputs; require 100 Ω series resistors to suppress dV/dt-induced current injection and EMI coupling.
9 PROG	Sleep mode programming	Resistor-to-GND sets VPROG (9–11 μA sourced); selects predefined conduction duty cycle tables for startup/sleep transitions per Table 4–7 of DS10811.
10 EN	Enable & remote control	Three-function pin: disables sleep mode at startup (V > V_{SM_off}), enables remote ON/OFF during run (V < V_{EN_OFF}), and programs sleep entry duty cycle via resistor.

Key Features

Feature	Design Value
Adaptive turn-on masking	Dynamic delay (100 ns–2 μs) prevents false triggering from capacitive spikes - maintains efficiency across 1–100% load without manual tuning.
Two-slope adaptive turn-off	Self-adjusting conduction period maximizes MOSFET on-time cycle-by-cycle - eliminates need for external stray inductance compensation components.
ZCD fast turn-off	Self-adaptive zero-current comparator with 450 ns blanking - provides fail-safe protection against current inversion during fast transients or short-circuit events.
Intelligent sleep mode	User-programmable entry/exit load thresholds (via PROG/EN resistors) with soft transitions - reduces no-load consumption to 50 μA while avoiding audible noise or output instability.
High-voltage Kelvin sensing	90 V drain-to-source sensing with dedicated SVS/DVS pairs - enables accurate timing in high-V_out LLC topologies (e.g., 48 V server rails) without level-shifting.

Applications

AC-DC Adapters

High-End Flat Panel TV

Use Scenario: 65 W–120 W universal-input adapters for laptops and monitors requiring >90% efficiency at 20% load.

IC Role / Device Role / Timing Role: Secondary-side synchronous rectifier controller managing dual N-MOSFETs in full-wave LLC configuration; precisely times turn-on/off using adaptive masking and ZCD to minimize body diode conduction.

Use Value: Reduces secondary-side conduction losses by >40% vs. Schottky diodes, enabling compact adapter designs compliant with DOE Level VI and EU CoC Tier 2.

Use Scenario: 200 W–300 W integrated power supplies in 4K/8K LCD TVs with strict standby power limits (<0.5 W).

IC Role / Device Role / Timing Role: Adaptive SR controller coordinating with primary LLC controller (e.g., L6699) to maintain zero-voltage switching across wide load range; enters intelligent sleep mode below 5% load.

Use Value: Achieves <0.3 W no-load consumption via 50 μA quiescent current and programmable burst-mode exit, satisfying ENERGY STAR v8.0 standby requirements.

90+/92+ Server SMPS

Industrial SMPS

Use Scenario: 800 W–1.5 kW redundant ATX-style server PSUs targeting Titanium efficiency certification (94% @ 50% load, 90% @ 10% load).

IC Role / Device Role / Timing Role: Dual-channel SR controller with Kelvin sensing and ZCD protection ensuring reliable operation under dynamic CPU/GPU load steps and short-circuit faults.

Use Value: Enables >92% efficiency at 10% load via adaptive turn-off and programmable sleep thresholds - critical for datacenter PUE optimization.

Use Scenario: 300 W–600 W industrial open-frame SMPS operating in −40°C to +85°C ambient with high reliability demands.

IC Role / Device Role / Timing Role: Robust SR controller with −40°C to +150°C junction rating, SSOP10 package, and 130 °C/W R_{th j-amb} - sustains full performance without derating in convection-cooled enclosures.

Use Value: Eliminates need for heatsinking on SR controller IC, reducing BOM count and improving long-term reliability in harsh environments.

Equivalent & Alternatives

The following parts are listed as comparable options for similar secondary-side synchronous rectification applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor NCP4306DR2G	Single-channel SR controller with fixed 120 ns turn-off delay; lacks adaptive turn-on masking and ZCD comparator.	Targeted at cost-sensitive mid-range LLC adapters; not suitable for 90+/92+ server SMPS requiring dynamic light-load optimization.	Select when BOM simplicity and lower unit cost outweigh need for adaptive efficiency tuning and ZCD fault protection.
Vishay SiHP20N60E	Discrete 600 V N-channel MOSFET - not a controller; requires external timing circuitry or MCU-based SR management.	Used in custom-designed SR solutions where timing is managed by primary controller or digital signal processor.	Select only for fully customized designs with existing gate drive infrastructure and engineering resources to implement adaptive logic externally.

Compared with NCP4306DR2G, SRK2001TR delivers superior light-load efficiency via programmable sleep mode and eliminates risk of current inversion through integrated ZCD protection - essential for high-reliability server and industrial applications where fault tolerance is non-negotiable.

Availability

SRK2001TR is available at Aetrix Electronics and suitable for AC-DC adapters, high-end flat panel TV power supplies, and 90+/92+ compliant server SMPS requiring stable component supply, long lifecycle support, and guaranteed traceable sourcing.

Supply support for SRK2001TR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

The SRK2001TR belongs to ST's high-efficiency power conversion controller product line, engineered specifically for adaptive secondary-side synchronous rectification in resonant topologies - targeting ultra-high efficiency and ultra-low standby power in next-generation SMPS.

FAQ

What is the minimum recommended series resistor for DVS1/DVS2 pins?

The datasheet mandates a minimum 100 Ω resistor in series with each DVS pin to limit dynamic current injection and prevent damage from dV/dt-induced transients. Using less than 100 Ω risks exceeding absolute maximum ratings during fast switching events, especially in high-frequency LLC designs above 300 kHz. This value is validated across temperature and process corners in DS10811 Rev 7.

How does the PROG pin select between sleep mode and burst mode exit behavior?

The PROG pin voltage - set by a resistor to GND and sourced by an internal 9–11 μA current - selects one of two internal lookup tables (Table 5/6 for sleep mode, Table 7 for burst mode). A 100 kΩ resistor yields ~1.0 V and selects 40% min. duty cycle for sleep entry; 180 kΩ yields ~1.8 V and selects 25%, enabling fine-grained control over light-load transition points without firmware changes.

Can SRK2001TR drive multiple parallel MOSFETs per channel?

Yes - each GD1/GD2 output delivers up to −0.35 A peak source and 4 A peak sink current, sufficient to drive multiple N-channel MOSFETs in parallel. Layout best practice requires matched gate trace lengths and Kelvin connections to SVS/DVS pins to preserve timing accuracy and avoid shoot-through in multi-MOSFET configurations.

What happens if VCC drops below 4.25 V during operation?

When VCC falls below the UVLO turn-off threshold (4.25 V typical), the device disables gate drivers and enters low-consumption mode with I_q ≤ 65 μA. Gate outputs are actively pulled low to ensure SR MOSFETs remain off. Operation resumes only after VCC rises above 4.5 V (turn-on threshold) with hysteresis - preventing oscillation near the UVLO boundary during brown-out conditions.

SRK2001TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 10-SOP (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

Applications:: Secondary-Side Controller, Synchronous Rectifier

Voltage - Input:: -

Voltage - Supply:: 4.5V ~ 32V

Current - Supply:: 35 mA

Operating Temperature:: -25°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 10-SSOP

SRK2001TR FAQ

1.How can I place an order for SRK2001TR through Aetrix?

Please submit a Request for Quotation (RFQ) for SRK2001TR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for SRK2001TR reliable?

The price and inventory of SRK2001TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SRK2001TR is usually 5 days.

3.What payment methods are accepted for SRK2001TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SRK2001TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SRK2001TR?

SRK2001TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SRK2001TR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for SRK2001TR?

For technical support, including SRK2001TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SRK2001TR requirements.

6.How does Aetrix verify that SRK2001TR is sourced from the original manufacturer or authorized distributors?

All SRK2001TR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SRK2001TR meets industry standards.

7.What is the process for return or replacement of SRK2001TR?

All SRK2001TR units undergo pre-shipment inspection (PSI). If there is an issue with SRK2001TR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The SRK2001TR part is unused and in its original packaging.

Return procedure for SRK2001TR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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